Palmed off to xbox support
you would expect to be helped by the retailer of your product, instead you get palmed off to xbox support to fix their errors, was sold a code that 'currency mismatched'.. i got there with it in the end but not through livecards, yes the first occasion was an overlap but again the next day when the old subscription expired I contacted again because I had the same error message even though there was no longer an overlap